Patent US3864176A successfully refreshed from Google Patents.
US3864176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moulding of superplastic alloy sheet
Assignee: ISC Alloys Ltd
•
Filing: 1973-06-14
•
Granted: 1975-02-04
•
Expires: 1993-06-14
Abstract
Abstract A superplastic alloy sheet material which has been removed from a mould is held at a temperature of from 180* to 220*C to remove undesired warping or distortions from the moulded sheet.
Inventors
- 👤 Colin John Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:59
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/053; B21D26/055; C; C22; C22F; C22F1/00; C22F1/16; C22F1/165
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
A method as claimed in claim 1 comprising carrying out the heat treatment of the moulded sheet for at least 10 minutes.
Claim 2
Dependent Claim
43 words
A method as claimed in claim 1 comprising cooling at least one of the surface of the moulded sheet adjacent the mould and the surface of the moulded sheet remote from the mould to facilitate removal of the moulded sheet from the mould.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 3 comprising cooling the said at least one surface of the moulded sheet by air blowing.
Claim 4
Dependent Claim
21 words
A method as claimed in claim 3 comprising cooling said at least one surface of the moulded sheet by water spraying.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 1 comprising supporting the moulded sheet during the heat treatment on a surface complementary to the surface of the sheet.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 1 comprising moulding the heated blank of sheet material to conform to a moulded surface of desired shape by an applied fluid pressure.
Claim 7
Dependent Claim
28 words
A method as claimed in claIm 1 comprising moulding the heated blank of sheet material to conform to a moulded surface of desired shape by an applied vacuum.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1 wherein the zinc/aluminium alloy contains up to 0.5 percent by weight of copper or magnesium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |